title: Greater effect of adiposity than physical activity or lean mass on physical function in community-dwelling older adults.
abstract: Adiposity, lean mass, and physical activity (PA) are known to influence physical function in older adults, although the independent influences are not completely characterized. Older adults (N = 156, M age = 68.9 ± 6.7 yr, 85 men) were assessed for body composition via dual-energy X-ray absorptiometry, PA by accelerometer, and physical function via timed up-and-go (UP&GO), 30-s chair stand, 6-min walk (6-min WALK), and Star-Excursion Balance Test. In the absence of percentage-body-fat by PA interactions (p > .05), main effects existed such that a higher percentage body fat was associated with poorer performance in UP&GO, 30-s chair stand, and 6-min WALK (p < .05). No significant main effects were found for PA and functional performance. Adiposity explains 4.6-11.4% in physical functional variance (p < .05). Preventing increases in adiposity with age may help older adults maintain functional independence.
authors.affiliation: Dept. of Kinesiology, University of Georgia, Athens, GA.
authors.forename: Christie L
authors.initials: CL
authors.lastname: Ward
authors.forename: Rudy J
authors.initials: RJ
authors.lastname: Valentine
authors.forename: Ellen M
authors.initials: EM
authors.lastname: Evans
mesh_terms: D061725:Accelerometry; D050154:Adiposity / Q000502:physiology*; D000368:Aged / Q000502:physiology*; D001823:Body Composition; D015992:Body Mass Index; D015444:Exercise / Q000502:physiology*; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D057187:Independent Living; D008297:Male; D004856:Postural Balance / Q000502:physiology*; D012044:Regression Analysis; D057185:Sedentary Behavior; D016138:Walking / Q000502:physiology*